Re: [PATCH v5 1/4] mfd: add syscon driver based on regmap

[Sergei Shtylyov]

Hello.

On 04-09-2012 15:35, Andi Shyti wrote:

> > +static int __devinit syscon_probe(struct platform_device *pdev)
> > +{
> > +	struct device *dev = &pdev->dev;

> Do we really need this variable? Anyway you are using it only
> once in the dev_info.

   But Dong definitely could use it more than once, so it seems useful.

> > +	struct device_node *np = dev->of_node;
> > +	struct syscon *syscon;
> > +	struct resource res;
> > +	int ret;
> > +
> > +	if (!np)
> > +		return -ENOENT;
> > +
> > +	syscon = devm_kzalloc(&pdev->dev, sizeof(struct syscon),
> > +			    GFP_KERNEL);
> > +	if (!syscon)
> > +		return -ENOMEM;
> > +
> > +	syscon->base = of_iomap(np, 0);
> > +	if (!syscon->base)
> > +		return -EADDRNOTAVAIL;
> > +
> > +	ret = of_address_to_resource(np, 0, &res);
> > +	if (ret)
> > +		return ret;
> > +
> > +	syscon_regmap_config.max_register = res.end - res.start - 3;
> > +	syscon->regmap = devm_regmap_init_mmio(&pdev->dev, syscon->base,
> > +					&syscon_regmap_config);
> > +	if (IS_ERR(syscon->regmap)) {
> > +		dev_err(&pdev->dev, "regmap init failed\n");
> > +		return PTR_ERR(syscon->regmap);
> > +	}
> > +
> > +	syscon->dev = &pdev->dev;
> > +	platform_set_drvdata(pdev, syscon);
> > +
> > +	dev_info(dev, "syscon regmap start 0x%x end 0x%x registered\n",
> > +		res.start, res.end);
> > +
> > +	return 0;

> in case of error you are not freeing syscon.

   It's allocated using devm_kzalloc(), so is freed automaticelly upon probe 
error.

> Moreover, in my opinion, some dev_err more should not heart

   Hurt, you mean?

> Andi

WBR, Sergei

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